Polyester block copolymer composition
A polyester block and copolymer technology, which is applied in the field of polyester block copolymer compositions, can solve the problems of unstable and unsatisfactory quality of molded products, unstable quality of large molded products, etc.
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[0089] Examples and comparative examples are given below to illustrate the present invention. However, the present invention is not limited by the examples.
[0090] In the examples, "parts by weight" are simply expressed as "parts". In practice, MI value, tensile breaking strength, elongation, melting point, color tone, acid value, hydrolysis resistance, heat resistance stability, and melt viscosity stability Properties, strain hardening properties, spinneret drawdown properties, etc. were measured in accordance with the following points.
[0091] (1) MI (melt index) value
[0092] Measurement was performed using a weight of 2.160 kg at 230°C (unit: g / 10 min).
[0093] (2) Tensile breaking strength and elongation
[0094] The thin sheet is hot-pressed into a 2mm thick flat plate, then punched into a dumbbell No. 3 test piece, stretched at a speed of 200 mm per minute, and the load at break (kg) is divided by the initial cross-sectional area (cm 2 ) is the tensile breaking...
manufacture example 1
[0116] What crystalline aromatic polyester (A) used is polybutylene phthalate (commercial product, fusing point 225 ℃) that acid value is 3.5 mg·KOH / gram and water content is 520ppm, and it is made of terephthalic acid and isophthalic acid Phthalic acid is formed as the acid component and 1,4-butanediol as the diol component. As the lactones (B), ε-caprolactone (commercial product) having an acid value of 0.5 mg·KOH / g and a water content of 450 ppm was used.
[0117]In a reaction vessel equipped with a stirrer, a thermometer, a condenser, a line for distillation, etc., 60 parts of polybutylene phthalate and 40 parts of ε-caprolactone were charged. It was mixed and reacted for 1 hour at a reaction temperature of 235°C. Then, while maintaining the above temperature, the pressure was reduced from normal pressure to below 1 Torr over 1 hour, and the pressure was reduced for another 1 hour in this state, thereby removing ε-caprolactone remaining in the system. The acid value of t...
manufacture example 2
[0119] The crystalline aromatic polyester (A) used was obtained by drying the polybutylene phthalate used in Production Example 1 at 150° C. and 1 Torr for 1 hour (acid value: 3.5 mg·KOH / g, containing Water volume: 160ppm). In addition, as the lactones (B), commercially available ε-caprolactone was distilled under reduced pressure (acid value: 0.1 mg·KOH / g, water content: 70 ppm).
[0120] A polyester block copolymer was prepared in the same procedure as in Production Example 1 except that the above-mentioned raw materials were used. The obtained polyester block copolymer had an acid value of 3.5 mg·KOH / g, a melting point of 203°C, and a water content of 200 ppm after drying at 120°C for 5 hours. This copolymer is the polyester block copolymer [B].
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Abstract
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